Question

How do I complete my code using an external file?

External file: data.txt

//the number 6 is in the external file

Incomplete code:

#include <iostream>
#include <fstream>

using namespace std;

class example {
   int data[1];

public:

   example();

   void read(ifstream &);

};

example::example()
{
   ifstream infile;
   infile.open("data.txt");
  
}

void example::read(ifstream &infile)
{
   infile >> data[1];
   cout << data[1] << endl;
  
}

int main()
{
   example example, read;

//system("pause");
   return 0;
}

Answer 1

C++ CODE:

#include <fstream>

#include <iostream>

using namespace std;

class example {

    int data;

    ifstream infile;

   public:

    example();

    void read();

    ~example();

};

// Constructor to open file

example::example() {

    infile.open("data.txt");

}

// Function to read an integer from the file

void example::read() {

    // Only read from file if end of file is not reached

    if (!infile.eof()) {

        infile >> data;

        cout << data << endl;

    } else {

        cout << "Reached end of file" << endl;

    }

}

// Destructor to close file

example::~example() {

    infile.close();

}

int main() {

    example ex;

    ex.read();  // Prints 6

    ex.read();  // Prints "Reached end of file"

    ex.read();  // Prints "Reached end of file"

    return 0;

}

OUTPUT:

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